Restauration de la cité du Lignon



Date de réalisation


Ingénieur civil


Maître de l'ouvrage

Office du patrimoine et des sites (OPS) - DALE - République et Canton de Genève, Office cantonal de l’énergie (OCEN) - DIME - République et Canton de Genève, Comité Central du Lignon

Autre(s) intervenant(s)

SORANE S.A. Ingénieurs conseils en rationalisation énergétique, Dominique Chuard architecte

Surface brute





mandat direct


TSAM ENAC EPFL / FRANZ GRAF , GIULIA MARINO,Jaccaud Spicher Architectes Associés

Interview de l'architecte Interview de l'architecte

Descriptif Descriptif

Designed by architect Georges Addor and his partners between 1963 and 1971, Le Lignon is the biggest housing estate in Switzerland. This massive development comprises 84 walkways, distributed between a ‘low-rise’ building more than a kilometre in length, the longest in Europe at the time of its construction, and two tower blocks on the banks of the Rhône. With 2,370 housing units, the buildings are of significant historical importance and were the subject of a site plan in 2009 to ensure the conservation of the estate. Nonetheless the façades require major renovation work to bring them up to contemporary standards and ensure their sustainability. Aware of the challenges faced by this site of considerable heritage value, the authorities have been moved to undertake a preliminary and global study of intervention strategies in order to prepare for and manage the restoration works of numerous owners. In 2010 a research project was entrusted to the Ecole polytechnique fédérale de Lausanne (technical laboratory for the conservation of modern architecture –TSAM–). This study approved a series of conservation measures required to bring the envelope up to energy standards, with the objective of conserving as much as possible of the substance of the curtain wall characteristic of this building. The Genevan practice Jaccaud Spicher Architectes Associés was then commissioned by the Lignon Central Committee – a body representing all the owners – to submit an application for building permission to the authorities. Granted in 2011, this ‘framework’ permission for the thermal refurbishment of the façades offers the different owners of the Lignon estate the possibility of renovating their own properties, choosing from three possible variants of refurbishment work while complying with the requirements for historic buildings. Since then, and on behalf of different owners, Jaccaud Spicher Architectes Associés has carried out various renovation works to improve the thermal properties of the façades, walkways and common parts of several buildings. In 2012, the renovation of the façades of building No. 49 served as the first prototype building, as did the service ducts at No. 11 a year later. Several apartments also underwent renovation work that established principles to be repeated on a large scale. In particular, these renovations have determined a palette of materials and details in keeping with the original character of the buildings. Since April 2017, no fewer than 17 of the block’s walkways have been undergoing building work, renovating 450 apartments in total. At the same time, the architectural practice is preparing for the renovation of the small tower block and its 240 apartments.

Plans Plans

Photos Photos

Autres références Autres références

Restauration de la cité du Lignon

Laboratoire des Techniques et de la Sauvegarde de l’Architecture Moderne (TSAM) Ecole Polytechnique Fédérale de Lausanne (EPFL-ENAC-TSAM) BP 4126 (bâtiment polyvalent) Station 16 1015 Lausanne

Tél: +41 21 693 36 29

Accessibilité TPG Accessibilité TPG

Arrêt "Cité Lignon": Lignes 7 - 9 - 23 - 51

Credits Credits

Images ©Joel_Tettamanti Plans ©JSAA